Question:
A spherical surface of radius $30 \mathrm{~cm}$ separates two transparent media A and B with refractive index $1.33$ and $1.48$ respectively. The medium $\mathrm{A}$ is on the convex side of the surface. Where should a point object be placed in medium A so that the paraxial rays become parallel after refractive at the surface?
Solution:
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